         fixture (write-code! "java" dir fixture)
         setup (when (not (empty? setup)) (write-code! "java" dir setup))
         solution (write-code! "java" dir solution)
-        files (file-names [fixture setup solution])]
+        files (file-names fixture setup solution)]
     (apply compile! files)
     (->> fixture :class-name (load-class dir) run-junit-tests)))

(ns codewars.runner
  (:require [codewars.runner :refer [run]]
            [clojure.java.io :as io]
            [codewars.util :refer [write-code!]])
  (:import [codewars.java TempDir]

  (let [dir (TempDir/create "java")
        setup (when (not (empty? setup)) (write-code! "java" dir setup))
        solution (write-code! "java" dir solution)
        files (file-names setup solution)]
    (apply compile! files)
    (-> solution
        :class-name
